Multipurpose magnetic holder with permanent magnet



y 1963 E. uc: ETAL 3,089,066

MULTIPURPOSE MAGNETIC HOLDER WITH PERMANENT. MAGNEE Filed May 27, 1960 4Sheets-Sheet 1 %//A/ 4 9 I 1 12 19 INVENTORS.

duard Uc May 7, 1963 E. uc ETAL 3,089,065

MULTIPURPOSE MAGNETIC HOLDER WITH PERMANENT MAGNET Filed May 27, 1960 4Sheets-Sheet 2 INVENTORS.

Edaard Uc BY Kare! Kopz z'z/a WM W/ E. Uc ETAL May 7 MULTIPURPOSEMAGNETIC HOLDER WITH PERMANENT MAGNET 4 Sheet et 5 Filed y 27, 1960 m wWe}. m M 5 e 5 m y 7, 3 E. uc ETAL 3,089,066

MULTIPURPOSEMAGNETIC HOLDER WITH PERMANENT MAGNET Filed May 27, 1960 4Sheets-Sheet 4 INVENTORS. Edzgard U0 By Kare? li'opz z'ra nited StatesPatent slovakia Filed May 27, 1960, Ser. No. 32,295 Claims priority,application Czechoslovakia June 2, 1959 13 Claims. (Cl. 317-159) Theinvention relates to magnetic work holders and particularly to amultipurpose magnetic work holder equipped with a permanent magnet. I

The position of the magnet of th1s inventlon can be adjusted relative toa non-magnetic pole plate, and the magnet is so arranged with respect tothis pole plate and to the body of the work holder that at least foursubstantially fiat faces of the holder body may exert the fullattraction force of the magnet. The faces of the holder body enableseveral objects of magnetic material to be simultaneously held with thefull attraction force of the magnet and in differently inclined planes.The magnet is movable in the holder for adjusting the magnetic flux sothat the flux either traverses the fastened object or objects, or iscontained within the holder body. This movement of the magnet isactuated by a suitably shaped and arranged handle.

The magnetic holder according to the invention has great versatility inservice and the known advantageous features of hitherto made magneticholders, while avoiding certain drawbacks of the known devices as willbecome apparent presently.

The magnetic work holders according to this invention have anon-magnetic pole plate located in the median plane of the holder body.Its position with respect to the magnetic axis of the magnet enables thefront and the rear faces of the holder to attract fiat as well ascylindrical objects. The bottom face may also be used for fastening flator cylindrical objects and the top face for the fastening of fiatobjects. This is achieved by arranging the axis of rotation of themagnet parallel to the axis of a holder rod, and by placing theoperating handle of the magnet on the top face of the holder Where theholding rod which serves for supporting an indicator such as a dialgauge or the like, is also fastened, i.e. at the most accessible pointof the magnetic work holder. This arrangement permits full utilizationof all magnetically active surfaces of the holder and enablesmeasurements to be made in various positions. The surface area availablefor fastening fiat, cylindrical or profiled objects is much increased incomparison with hitherto used magnetic holders. The several fasteningfaces of the holder are provided with respective V-grooves which areangularly offset with respect to each other. It is an additionaladvantage of the magnetic holder according to the invention that itpermits fastening several objects at right angles or obliquely relativeto one another with the full force of the magnet by the use of adaptersor extensions positioned on the fastening faces of the holder. Thus, itis possible to fasten one or more objects or measuring devices, such asa rule, a level, etc. on a common reference surface so that the operatormay occupy himself with other measuring tasks or with the Work on somemachine. It is also possible to use the magnetic multipurpose workholder when welding together two flat, cylindrical, or profiled objectswhich are inclined relative to one another at any angle.

The accompanying drawings illustrate a preferred embodiment of themultipurpose magnetic holder of the present invention.

FIG. 1 is a perspective view of the holder.

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FIG. 2 shows the holder of FIG. 1 in side elevational section throughthe non-magnetic pole plate.

FIG. 3 is a plan view of the holder of FIG. 1 taken in section on theline A--A of FIG. 2.

FIG. 4 is a top view of the device of FIG. 1.

FIG. 5 shows the apparatus of FIG. 4 equipped with an angular adapter.

FIG. 6 is a perspective view of the holder of FIG. 1 fitted with anangular extension memberl.

FIG. 7 illustrates the use of an extension member for the welding ofmetal sheets.

FIG. 8 illustrates the use of two work holders of the invention forfastening an object to a vertical surface.

The basic work holder of the invention is of approximately cubic overallshape. It includes two magnetic body portions 1 and 1 and a non-magneticspacing element or pole plate 13 interposed between the body portions 1and extending in a median plane of the work holder parallel to two ofthe external faces. The body portions 1, 1 thus jointly form four of thefaces of the work holder whereas the other two are formed by a singlebody portion. The pole plate 13 separates the body portions in thejointly formed faces.

The body portions 1, 1 and the pole plate 13 leave a cylindrical cavitywithin the work holder the axis 15 of which lies in the afore-mentionedmedian plane. One axial end of the cavity is closed by a non-magneticcover plate 30. The plate 30 projects outward from one of the jointlyformed faces of the work holder. This face will be referred tohereinafter as the top face for convenience of description, it beingunderstood that the work holder may be oriented in space in any desiredmanner.

A shaft 18 which is rotatable about the axis 15 passes through the plate30. The inner terminal portion of the shaft 18 in the work holder cavityis forked and holds a magnet 19 having the shape of a cylinder lackingtwo segments defined by parallel axial planes on opposite sides of theaxis 15. The magnetic axis 14 of the magnet 19 is parallel to thelast-mentioned planes and perpendicular to the axis of rotation 15. Theouter terminal portion of the shaft 18 carries a two-armed handle 16 bymeans of which the magnet 19 may be rotated. A holding rod 17 isthreadedly mounted in the plate 30 and extends therefrom parallel to theaxis 15.

When the magnet 19 is in the position seen from FIGS. 1 to 3, themagnetic flux produced by the magnet passes through all external facesof the holder with the exception of the two side faces 12 which areparallel to the non-magnetic pole plate 13. Magnetic objects maytherefore be fastened to the front face 2 of the holder, to the rearface 4 and the bottom face 9 which are not seen in FIG. 1, and also tothe top face portions v11 adjacent the handle 16 and rod 17. The rod mayadditionally carry an indicator such as a dial gauge or other measuringdevice. The rod 17 also acts as an abutment which limits the rotation ofthe handle 16 and serves as a support for the hand of the operator. Thisovercomes the torque of the magnet when fastening or removing an objectand which would otherwise require the use of both hands. As can be seenfrom FIG. 2, the forked terminal shaft portion 18 holds the magnet onlyat one side, leaving the bottom face 9 of the holder unencumbered forfastening an object thereon.

The main fastening faces 2, 4, 9 are adapted to their task in aparticular way. The front face 2 is partly beveled in an inclinedvertical plane 6, in such a way that a vertically elongated narrowportion 32 of the face 2 on the body portion 1' adjacent one of the sidefaces 12 is perpendicular to both side faces .12, and an adjacent narrowportion 7 of the face 2 is inclined in the plane 6 relative to the faceportion 32. The portion 29 of the face 2 on the body portion 1 adjacentthe other side face 12 lies in the same plane 6 as the face portion 7,and is therefore spaced by an air gap 8 (FIG. 4) from a. plane definedby the face portion 29. The air gap 8 may be filled with non-magneticmaterial.

The afore-descr ibed configuration of the front face 2 enables themagnetic holder according to the invention to fasten more than oneobject with the full force of the magnet 19 to a supporting surface asshown in FIG. 8. Two work holders 2t) of the afore-described type areeach used primarily as a holder for an indicator (not shown). They aremagnetically fastened to a vertical surface 21 of a machine tool whilesimultaneously securing a spirit level 22 to the surface 21 with thefull force of their magnets. The magnetic flux of each holder issuesfrom the north pole N of the magnet, traverses the fastening faceportion 32 and the level '22 without being able to return directly tothe south pole S through the air gap 8. It is compelled to traverse alsothe supporting surface 21 and returns therefrom to the south pole S asindicated by the arrows. Because of this arrangement, the operator canfully apply himself to the adjustment of instruments, to the alignmentand the operation of the machine, to the preparation of records etc. Heis able to readily fasten additional devices to the work holders, or tosubstitute them for previously attached devices.

FlG. indicates how to enlarge the air gap 8 by means of an angularadapter 23, 24 superimposed on the face 2. The adapter consists of amagnetic part 23 and a nonmagnetic part 24. The front face 25 of theangular adapter 23, 24 may form any angle with the plane 6 of thebeveled front face of the holder, and a magnetic holder according to theinvention or several holders when equipped with such adapters may beused for welding together sheets, tubes or rods which are inclinedrelative to one another at oblique angles while these objects aresecured by the full magnetic flux of the holders. It is also possible toapply an angular extension member to the magnetic multipurpose holder 20as shown in FIG. 6, the member consisting of two parts 26 of magneticmaterial and a spacer plate 27 of non-magnetic material. Faces 28 or 28ainclind at the required angle on the angular member permit fastening twoor more objects under the full magnetic flux.

lThe fastening faces 2, 4, 9 of the work holder have pairs of mutuallyinclined face portions 3, 5, 10. Each pair defines a groove of V-shapedcross section in the respective fastening face and permits the fasteningof cylindrical or profiled objects. It will be understood that the frontfaces of the angular adapter 23, 24 and of the extension member 26, 27may be provided with similar grooves.

When the magnetic multipurpose Work holder 20 is placed with one of itsfaces '2, 4, or 9 on a flat, cylindrical or profiled surface made ofmagnetic material, and the handle 16 is in the position shown in FIGS. 1to 3, the magnet 19 is in such a position that the magnetic fluxtraverses the object or objects on the fastening faces of the holder.When the magnet 19 is turned through a right angle from the positionillustrated, the magnetic flux forms a magnetic circuit inside the bodyof the Work holder. The mutual attraction of the fastened objects isenergized by the full force of the magnet 19, and this force is madeineffective by turned handle 16.

What We claim is:

l. A magnetic work holder comprising two magnetic body portions;non-magnetic spacing means interposed 65 between said body portions,said portions jointly defining a cavity in said holder and a pluralityof substantially flat work holding faces on said holder, said facesbeing angularly offset relative to each other; a permanent magnet insaid cavity, said magnet being rotatable about an axis passing throughone of said faces and having two magnet poles radially spaced from saidaxis in opposite directions.

2. A work holder as set forth in claim 1, wherein each of said workholding faces is offset relative to another one of said faces atsubstantially right angles.

3. A work holder as set forth in claim 1, further comprising rod meanssecured to one of said body portions and extending from one of saidfaces.

4. A work holder as set forth in claim 3, further com prising a shafthaving two terminal portions and rotatable about said axis, said magnetbeing mounted on one of said terminal portions in said cavity, the otherterminal por- Eion extending outward of said cavity through said oneace.

5. A work holder as set forth in claim 4, said shaft being rotatablymounted on said body portions and constituting the only mechanicalconnection between said magnet and said body portions.

6. A work holder as set forth in claim 1, further comprising a shafthaving two terminal portions and rotatable about said axis, said magnetbeing mounted on one of said terminal portions in said cavity, the otherterminal portfion extending outward of said cavity through one of saidaces.

7. A Work holder as set forth in claim 6, further comprising actuatingmeans on said other terminal portion for rotating said magnet in saidcavity.

8. A work holder as set forth in claim 1, one of said faces being formedwith an elongated groove of substantially V-shaped cross section.

9. A work holder as set forth in claim 1, wherein said plurality ofjointly defined faces includes three faces, each of said three facesbeing formed with an elongated groove of substantially V-shaped crosssection, the respective directions of elongation of said grooves beingsubstantially perpendicular to each other.

10. A work holder as set forth in claim 1, wherein said plurality ofjointly defined faces includes two adjacent faces, respective portionsof said two faces define two planes substantially perpendicular to eachother, and another portion of one of said two faces defines a planeobliquely inclined relative to said two perpendicular planes.

11. A work holder as set forth in claim 10, wherein said portions ofsaid one face are respectively formed by said two magnetic bodyportions.

12. A work holder as set forth in claim 1, further comprising an adaptermember superposed on one of said jointly defined work holding faces,said adapter member having a magnetic portion and a non-magneticportion, said adapter portions being respectively superposed on said twobody portions in said one work holding face.

13. A work holder as set forth in claim 1, further comprising anextension member superposed on one of said jointly defined work holdingfaces, said extension member having two magnetic portions andnon-magnetic spacing means interposed between said magnetic extensionmember portions, the two magnetic portions and the spacing means of saidextension member being respectively superposed on said two magnetic bodyportions in said one face.

References Cited in the file of this patent UNITED STATES PATENTS2,435,735 Briggs Feb. 10, 1948 2,449,255 Snecker Sept. 14, 19482,572,999 Elliott Oct. 30, 1951 FOREIGN PATENTS 531,946 Great BritainJan. 14, 1941

1. A MAGNETIC WORK HOLDER COMPRISING TWO MAGNETIC BODY PORTIONS;NON-MAGNETIC SPACING MEANS INTERPOSED BETWEEN SAID BODY PORTIONS, SAIDPORTIONS JOINTLY DEFINING A CAVITY IN SAID HOLDER AND A PLURALITY OFSUBSTANTAILLY FLAT WORK HOLDING FACES ON SAID HOLDER, SAID FACES BEINGANGULARLY OFFSET RELATIVE TO EACH OTHER; A PERMANENT MAGNET IN SAIDCAVITY, SAID MAGNET BEING ROTATABLE ABOUT AN AXIS PASSING THROUGH ONE OFSAID FACES AND HAVING TWO MAGNET POLES RADIALLY SPACED FROM SAID AXIS INOPPOSITE DIRECTIONS.